You might consider a 30 day membership depending on how many of you are traveling and how long a layover you have on your return. $90 for 30 days, unlimited visits for you + 2. Enjoy Istanbul!
Also, I've used the Oasis lounge in T-4 with the 30 day membership. Bring an extra copy of your membership printout, as they sometimes keep it.
Last edited by koly79; Oct 29, 2010 at 5:45 am
Reason: Added a sentence